We rented the Chalet Wyssbirg for one week of hiking in late September and we had a wonderful time. Wengen is, of course, a great place to visit, particularly when the weather is good. We were fortunate to have two days of exceptionally good weather, a couple of days of so-so weather, and a few days of clouds and rain. Wyssbirg has five bedrooms, one on the main floor and four downstairs. I would describe the facility as functional, nice, but not deluxe by any means. It has a very nice kitchen/living room upstairs that is great for getting a group together, and the laundry, which is combined with one of the bathrooms downstairs, is very helpful and convenient. If your expectations are not too high with regard to luxury, you will find the place to be very adequate. If you want real luxury, you should probably look elsewhere. One thing you should certainly keep in mind is that since Wyssbirg is next to the church, you will hear the church bells at all times of the day and night. The windows do seal much of the noise out, but not all of it. Bottom line: a nice place for a larger group or family to stay, but don't expect luxury.
